AT3 Tactical 5.56 NATO AR-15 Parts
5.56 AR-15 parts by AT3 Tactical, from BCGs to muzzle devices, and any AR part your rifle needs in between.
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AT3™
AT3™ SPEAR M-LOK Handguard for AR-15 – 9, 12, & 15 inch Lengths
The AT3 SPEAR™ is our best, most secure handguard. Simple to install, lightweight, and easy on the wallet. The slim free-float design enhances accuracy while minimizing the weight of...24 Options -
AT3™
AT3™ Pro Quad Rails – Free Float AR15 Handguards – 4 Lengths Available
The New and Improved Pro Quad Rail - Lightweight, Rigid, and Easier to Install The quad rail is still the gold standard of secure accessory mounting, but they're in...28 Options -
AT3™
AT3™ AR-15 Bolt Carrier Group (BCG) – 5.56 NATO/.300 Blackout – Black Nitride
AT3 Tactical is bringing you the best with this Top-Tier Black Nitride Bolt Carrier Group Getting a high quality bolt carrier group (BCG) that runs well in your rifle is... -
AT3™
AT3™ 1/2 Inch Crush Washer for .223/5.56 Muzzle Devices Compatible with AR 15
Time Your Muzzle Device with a Black Nitride Crush Washer from AT3 Crush washers are essential to replace after removing for replacing a muzzle device. Re-using crush washers can lead... -
AT3™
AT3™ AR 15 Upper Receiver and SPEAR Handguard Combo
Getting Started on Your Next Build? Go Sleek and Lightweight with our Billet Upper and SPEAR M-LOK Handguard. The slim free-float design of the SPEAR handguard enhances accuracy while minimizing...24 Options -
AT3™
AT3™ Mil Spec Buffer Tube Kit For AR-15 – 10 Colors Available
The perfect kit for your next build - at a price that can't be beat. This Mil-Spec AR-15 Buffer Tube Kit includes the buffer tube, castle nut, lock plate, 3oz...10 Options -
AT3™
AT3™ AR-15 3-Port Muzzle Brake with Crush Washer – 1/2×28 Thread for .223/5.56
Extreme Recoil Reduction at an Affordable Price Taming the recoil of 5.56 tends to be a pretty easy feat - but this muzzle device all but eliminates recoil with an... -
AT3™
AT3™ AR-15 A2 Mil-Spec Flash Hider with Crush Washer
High Quality Muzzle Device: Classic AR-15 Mil-Spec Flash Hider with Five-port "birdcage" Design Limits muzzle flash for effective use in all light conditions. Includes crush washer Machined steel with phosphate... -
AT3™
AT3™ AR-15 3-Port Muzzle Brake with Crush Washer – 5/8×24 Thread for .300 BLK/.308...
.30 Cal AR15? Not a problem with this aggressive Muzzle Brake/Compensator With greater caliber comes greater recoil - whether you're shooting a .300 BLK AR15 or a .308 WIN AR10,... -
AT3™
AT3™ AR-15 Replacement Bolt – 5.56 NATO/.300 Blackout – Black Nitride
AT3 Replacement AR-15 Bolt This AR-15 replacement bolt from AT3 Tactical easily replaces a broken bolt in your rifle. This bolt comes complete with extractor and ejector assemblies already installed... -
AT3™
AT3™ AR 15 Upper Receiver and Pro Quad Rail Handguard Combo
Upgrade or Start Your Next Build with our Newest Billet Upper and Pro Quad Rail Handguard Combo The AT3™ Pro Quad Rail, like the SPEAR, is designed for use with...28 Options -
AT3™
AT3™ Slick Side AR-15 Upper with Black Nitride 5.56 Bolt Carrier Group
AT3 Black Nitride Bolt Carrier Group with Slick Side Billet Upper - 8 Colors to Choose From Get a head start on your build with the AT3 Black Nitride Bolt...8 Options -
AT3™
AT3™ AR-15 Bolt Carrier Group – 5.56 NATO/.300 Blackout – Nickel Boron
Get the Performance You Need with a Nickel Boron Bolt Carrier Group Whether you're starting a fresh build or upgrading from stock, a bolt carrier group that performs reliably is... -
AT3™
AT3™ .223/5.56 Combat Flash Hider – AR15
Aggressive Design and Excellent Flash Reduction In the midst of combat, the importance of a good flash hider can't be overstated. What you want is something that controls the rise... -
AT3™
AT3™ FF-ML 11.5″ Complete AR 15 Pistol Upper – .223/5.56 11.5″ Ballistic Advantage Barrel...
The AT3 11.5" Pistol Upper with SPEAR M-LOK Handguard - Made to Order and Ships in 7 Days AT3 Complete Upper assemblies are Built for Accuracy and Reliability - Guaranteed....8 Options -
AT3™
AT3™ FF-ML 10.5″ Complete AR 15 Pistol Upper – Choose Your Own 10.5 inch...
The AT3 10.5" Pistol Upper with SPEAR M-LOK Handguard - Made to Order and Ships in 7 Days AT3 Complete Upper assemblies are Built for Accuracy and Reliability - Guaranteed....16 Options -
AT3™
AT3™ FF-ML Complete Rifle AR 15 Upper – .223/5.56 16″ Ballistic Advantage Barrel –...
16 Inch Lightweight AT3 Upper with 15 Inch Handguard - Made to Order and Ships in 7 Days AT3 Complete Upper assemblies are Built for Accuracy and Reliability - Guaranteed....16 Options -
AT3™
AT3™ 5.56 NATO Government Profile 16 Inch AR-15 Barrel
16 Inch Government 5.56 NATO Barrel by AT3 Tactical With a sturdy profile and proven construction, this 16 inch 5.56 NATO barrel features a midlength gas system for smoother recoil.... -
AT3™
AT3™ FF-ML 11.5 Inch Complete AR 15 Pistol Upper – .223/5.56 11.5 Inch Faxon...
AT3 11.5" Pistol Upper with Faxon Firearms Midlength Barrel - Made to Order and Ships in 7 Days AT3 Complete Upper assemblies are Built for Accuracy and Reliability - Guaranteed....8 Options -
AT3™
AT3™ 5.56 NATO Pencil Profile 16 Inch AR-15 Barrel
16 Inch Pencil 5.56 NATO Barrel by AT3 Tactical Upgrade your AR-15 with a 16 inch pencil barrel to improve your handling and save on weight. While the pencil profile... -
AT3™
AT3 Upper Receiver Black + AT3 Bolt Carrier Group + Breek Arms Warhammer Charging...
Complete your Next Build with AT3's Top-Selling Billet Upper Receiver and BCG plus the Trusted Breek Arms Warhammer Charging Handle Save by bundling vs purchasing the parts individually, plus free... -
AT3™
AT3™ FF-ML 10.5 Inch Complete AR 15 Pistol Upper – 10.5 Inch Faxon .223/5.56...
AT3 10.5" Pistol Upper with SPEAR M-LOK Handguard - Made to Order and Ships in 7 Days AT3 Complete Upper assemblies are Built for Accuracy and Reliability - Guaranteed. Quality...24 Options -
AT3™
AT3™ FF-ML Complete Match Grade AR 15 Upper – .223 Wylde 16 Inch Faxon...
AT3 16" 223 Wylde Complete Upper with M-LOK Handguard - Made to Order and Ships in 7 Days AT3 Complete Upper assemblies are Built for Accuracy and Reliability - Guaranteed....24 Options -
AT3™
AT3™ 5.56 NATO Government Profile 10.5 Inch AR-15 Barrel
10.5 Inch 5.56 NATO Barrel by AT3 Tactical This 10.5 inch long 5.56 NATO barrel is a perfect match for a shorty AR-15 build that won't break the bank. This...
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